Austin Air Quality in 2019
In 2019, Austin's air quality (Austin-Round Rock, TX area) had a median daily AQI of 52 (Moderate) across 365 monitored days. 2 days (0.5%) reached Unhealthy for Sensitive Groups or worse, 169 were Good, and the year's peak AQI was 115 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 255 of those days. The cleanest month of 2019 was October (median AQI 44, 0 days above 100) and the worst was September (median 48, 1 day above 100, peak 112).
- Good: 46.3%
- Moderate: 53.2%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Austin
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How was Austin's air quality in 2019?
Moderate on a typical day: median AQI 52, with 2 days above AQI 100 out of 365 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 115 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 255 days.
- ✓Cleanest month: October; worst: September.
Frequently asked questions
What was the average AQI in Austin in 2019?▾
EPA's Air Quality System puts Austin's (Austin-Round Rock, TX) median daily AQI for 2019 at 52, which is Moderate. 2 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 115.
Which month had the worst air quality in Austin in 2019?▾
The cleanest month of 2019 was October (median AQI 44, 0 days above 100) and the worst was September (median 48, 1 day above 100, peak 112).
Was 2019 a good or bad year for Austin's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 3rd cleanest by days above AQI 100. 2019's median of 52 is in line with the area's typical annual median of 52.
Austin month by month in 2019
Austin air quality month by month, 2019 (Austin-Round Rock, TX, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 38 | 1 | 115 | PM2.5 |
| February | 28 | 49 | 0 | 75 | PM2.5 |
| March | 31 | 51 | 0 | 84 | PM2.5 |
| April | 30 | 49 | 0 | 87 | O3 |
| May | 31 | 54 | 0 | 80 | PM2.5 |
| June | 30 | 52 | 0 | 84 | PM2.5 |
| July | 31 | 55 | 0 | 84 | PM2.5 |
| August | 31 | 53 | 0 | 87 | PM2.5 |
| Septemberworst | 30 | 48 | 1 | 112 | PM2.5 |
| Octobercleanest | 31 | 44 | 0 | 67 | PM2.5 |
| November | 30 | 53 | 0 | 72 | PM2.5 |
| December | 31 | 54 | 0 | 73 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 3rd cleanest by days above AQI 100.
2019's median of 52 is in line with the area's typical annual median of 52.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Austin
The latest EPA AirNow observation puts Austin's AQI at 17 (O3). The figures above are multi-year annual statistics, not today's reading.
View current Austin air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Austin-Round Rock, TX), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.